Kentucky is known ’round the world for its epic underground caverns, with one mammoth cave boasting a particularly impressive resume. But there’s another cave in Kentucky that’s also quite extraordinary, with its own record-breaking claims to fame, too. The Louisville Mega Cavern is a massive underworld that’s a true superlative superstar. Not only is it the largest building in Kentucky (more on that momentarily), but it’s also home to the only fully underground zip line in the entire world.

The Louisville Mega Cavern is a 100-acre, otherworldly underworld that’s truly remarkable. The Louisville Mega Cavern was originally utilized as a limestone quarry, and from 1930-1970, huge volumes of natural materials were extracted and removed, essentially creating an expansive underground grotto. Today, it’s a place for adventure seekers and explorers, with some of the most incredible experiences in the world.

The Louisville Mega Cavern is home to the only fully underground zip line on the planet. There are six zip lines located 100 feet above the canyon floor, with two swinging bridges, and immeasurable adventure.

But that’s not the only superlative up the Mega Cavern’s sleeve. It boasts the world’s only fully underground aerial ropes challenge course, the largest indoor bike park in the world, and the only fully underground holiday light display on the planet.

Besides that, with national and international attention, an underground mountain bike park was opened to riders of all skill levels in February 2015. It was constructed in over 3 months. With 45 trails in 350,000 sq ft (33,000 m2) of the cavern’s space, it was the world’s largest indoor bicycle park. 

According to onlyinyourstate.com; en.wikipedia.org. Source of photo: internet